more bugs with subtasks (from a drag & drop) and undo

I dragged a task in the task list onto another one, making the first a subtask of the latter.Now opening the parent task, I get the bug in the attached picture. I clicked on the subtask in the dialog but the details are not displayed and I cannot remove it (as a subtask). I opened the details panel inside the dialog manually so it is seen that there is no detail info.

also, when I click "undo" then the subtask (which was a full task on its own before) is "undone" to become a subtask of another, completely unrelated task.

This has been fixed in version 2018.00. When a subtask is selected, its details will appear. Also, the Undo command will properly undo drag-and-drop of task rows. To update, click the "Help -> Check for Updates" menu command.